ISHS Acta Horticulturae 700: International Symposium Towards Ecologically Sound Fertilisation Strategies for Field Vegetable Production
FURROW AND RIDGE SOIL NITROGEN MINERALIZATION IN A SURFACE IRRIGATED ARTICHOKE FIELD |
| Authors: | A. Lidon, L. Bautista, F. de la Iglesia, J. Oliver, R. Llorca, G. Cruz-Romero |
| Keywords: | soil organic nitrogen net mineralization, field incubation, laboratory incubation, chloride mass balance, bromide mass balance |
| Abstract:
Quantitative knowledge of soil organic nitrogen net mineralization (NNM) in field conditions is crucial to optimize N fertilization of crops. In a field fertilization trial on artichokes 48 PE tubes were inserted into the soil at 0.2 m depth along plant rows and irrigation furrows. Soil samples were periodically taken during 76 days to determine NNM. A parallel essay with disturbed samples separately collected from row and ridge was carried out in the laboratory at 25°C and 10 kPa soil water tension. Soil sample position (ridge and furrow) did not significantly determine NNM in the laboratory essay. Although NNM obtained from laboratory incubation and corrected to field soil temperature and moisture monitored during the experimental period overpredicted NNM measured in the field, matching of the two procedures was better than those reported in other studies. NNM rate for the 76 days period of incubation predicted from lab data was 22.9 kg N ha-1 x 0.1 m while corresponding field values corrected by Br- or Cl- mass balance were 10% and 20% lower respectively in ridge position and 40% lower by either method in furrow position. | |
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